Motor working condition simulation device and method integrated with port switch voltage online monitoring

Abstract

The application provides a motor working condition simulation device and method integrated with port switch voltage online monitoring. Through the integrated port switch voltage signal online monitoring circuit and the voltage sensor, the average value of the port voltage of the electric drive inverter, the pulse width modulation mode of the electric drive inverter, the carrier signal and the modulation signal and other key information can be extracted without relying on the voltage low-pass filter, the electric drive inverter carrier signal, the modulation signal or other voltage sampling devices. The motor working condition simulation device and method integrated with port switch voltage online monitoring provided by the application realize the carrier synchronization of the simulation inverter and the electric drive inverter to reduce the current ripple without the need of the electric drive inverter to provide the synchronization signal; and the extraction of the average value of the port voltage is realized without relying on the voltage sampling filter, so that the dynamic performance of the motor working condition simulation device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, in particular to a motor operating condition simulation device and method integrating port switch voltage online monitoring. BACKGROUND

[0002] With the development of motor technology, motors and their driving systems have been widely used in industrial and electric power driving fields. The power level and power density of power electronic converters in electric drive systems are constantly increasing, and their operating conditions are becoming more and more complex. In order to test and verify a series of functions and reliability of the electric drive system before it is put into use, motor simulation devices are becoming the mainstream testing method.

[0003] The typical motor simulator at present often uses a power electronic converter to reproduce the voltage and current of the electric drive system to be tested under actual operating conditions. Such a motor simulation device has the following limitations:

[0004] 1. Narrow application range. The port voltage of the electric drive system to be tested is often a pulse wave, which needs a voltage low-pass filter to filter the voltage. The cutoff frequency of the voltage low-pass filter limits the switching frequency range of the electric drive converter to be tested.

[0005] 2. Low accuracy and stability. The voltage low-pass filter is often a second-order filter, which has obvious resonance peaks. The resonance peaks result in low accuracy and stability of the motor simulation device.

[0006] 3. High hardware cost. In order to improve the testing efficiency, the electric drive converter to be tested often uses the same DC bus as the simulation converter, resulting in a large amount of high-frequency ripple in the system, which requires a large-capacity filter to suppress the ripple, resulting in high cost. SUMMARY

[0007] The present application provides a motor operating condition simulation device and method integrating port switch voltage online monitoring to overcome the above-mentioned deficiencies in the prior art.

[0008] According to one aspect of the present application, a motor operating condition simulation device integrating port switch voltage online monitoring is provided, comprising: a port switch voltage online monitoring board, a voltage sensor, a simulation converter, a resistance impedance network, a motor simulation controller, a speed signal generator and a current sensor.

[0009] The port switch voltage online monitoring board is used for measuring the voltage drop across the power semiconductor device when the device is turned on in the electric drive current converter; at the same time, the port pulse voltage with high voltage level during the operation of the analog current converter is converted into a pulse signal with low voltage level and consistent width; the input end of the port switch voltage online monitoring board is connected with the AC test port and the positive and negative bus bars of the analog current converter; the input end of the port switch voltage online monitoring board is connected with the positive and negative bus bars of the electric drive current converter to be tested and the AC test port; the input end of the port switch voltage online monitoring board is connected with the collector and emitter IGBT of the power semiconductor device in the electric drive current converter to be tested, or connected with the drain and source MOSFET;

[0010] The voltage sensor is used for acquiring the DC bus voltage during the operation of the analog current converter; the input end of the voltage sensor is connected with the positive bus bar and the negative bus bar of the analog current converter;

[0011] The analog current converter is used for reproducing the port voltage and current characteristics of the electric drive current converter, and adopts any one of the DC / AC topology structures or power semiconductor devices; the analog current converter is connected with the electric drive current converter to be tested through the electric resistance and impedance network;

[0012] The motor simulation controller is used for establishing a target motor model and controlling the analog current converter to reproduce the port voltage and current characteristics of the electric drive current converter; the output end of the port switch voltage online monitoring board, the voltage sensor and the output end of the current sensor are connected with the motor simulation controller;

[0013] The rotation speed signal generator is used for generating the rotation speed signal required by the electric drive controller, and realizing the decoupling between the motor simulation device and the electric drive controller; the rotation speed signal generator receives the rotation speed information calculated by the motor simulation controller, and converts the rotation speed information into a rotation speed signal; the output end of the rotation speed signal generator is connected with the electric drive controller;

[0014] The electric resistance and impedance network is used for filtering the high-frequency ripple current of the AC test port, and includes a differential mode resistance and impedance network and a common mode resistance and impedance network; one end of the electric resistance and impedance network is connected with the electric drive current converter to be tested, and the other end is connected with the analog current converter;

[0015] The current sensor is used for acquiring the current value of the AC test port.

[0016] Preferably, the port switch voltage online monitoring board can acquire the key information of the port voltage of the electric drive current converter using the port voltage of the electric drive current converter without relying on a voltage low-pass filter, a carrier signal of the electric drive current converter, a modulation signal or a voltage sampling device;

[0017] The key information of the port voltage of the electric drive current converter includes one or more of the following:

[0018] average value of the port pulse voltage in a switching cycle;

[0019] pulse width modulation mode of the electric drive inverter;

[0020] carrier signal of the electric drive inverter;

[0021] modulation signal of the electric drive inverter.

[0022] Preferably, the key information of the electric drive inverter port voltage can be used as input of the motor simulation device motor model, simulation of the inverter and the carrier of the electric drive inverter in the motor working condition simulation device, active harmonic elimination.

[0023] Preferably, the carrier signal extraction process of the electric drive inverter comprises:

[0024] determining the loading point of the electric drive inverter modulation signal: the on and off time of the electric drive inverter port pulse signal obtained by the on-line monitoring board is counted, the first on count value is c1, the first off count value is c2, six on and off cycles are counted in succession, the count values are c1-c6, if the count values satisfy c1+2·c2+c3=c3+2·c4+c5, the loading point is the carrier peak value; if the count values satisfy c2+2·c3+c4=c4+2·c5+c6, the loading point is the carrier valley value.

[0025] extracting the carrier cycle of the electric drive inverter: when the loading point of the electric drive inverter modulation signal is the carrier peak value, the carrier cycle is:

[0026]

[0027] when the loading point of the electric drive inverter modulation signal is the carrier valley value, the carrier cycle is:

[0028]

[0029] wherein, t sw is the carrier cycle, t ctrl is the count cycle.

[0030] extracting the carrier phase of the electric drive inverter: when the loading point of the electric drive inverter modulation signal is the carrier peak value, the low level time of the electric drive inverter port voltage is counted, and the carrier count value is reset after the counting is completed:

[0031]

[0032] when the loading point of the electric drive inverter modulation signal is the carrier valley value, the high level time of the electric drive inverter port voltage is counted, and the carrier count value is reset after the counting is completed:

[0033]

[0034] wherein c re is the count value of the carrier extracted, c x_off is the count value of the low level time of the electric drive inverter port voltage, c x_on is the count value of the high level time of the electric drive inverter port voltage.

[0035] Preferably, the extraction process of the modulation signal of the electric drive inverter comprises:

[0036] extracting the carrier period t sw of the electric drive inverter;

[0037] counting the high level time of the electric drive inverter port voltage, the count value being c x_on ;

[0038] calculating the modulation signal value of the electric drive inverter in each switching period as:

[0039]

[0040] wherein duty is the modulation signal value of the electric drive inverter in each switching period.

[0041] Preferably, the extraction process of the pulse width modulation mode comprises:

[0042] continuously recording the modulation signal of the electric drive inverter in n fundamental periods according to the modulation signal of the electric drive inverter;

[0043] if the modulation signal of the electric drive inverter is a sine wave, the pulse width modulation mode of the electric drive inverter is SPWM;

[0044] if the modulation signal of the electric drive inverter is a saddle wave, the pulse width modulation mode of the electric drive inverter is CPWM;

[0045] if the modulation signal of the electric drive inverter is a clamped, non-continuous waveform, the pulse width modulation mode of the electric drive inverter is DPWM.

[0046] Preferably, the extraction process of the average value of the electric drive inverter port pulse voltage in a switching period comprises:

[0047] extracting the modulation signal of the electric drive inverter;

[0048] using the port switch voltage online monitoring board to obtain the conduction voltage drop V ceu of the inverter bridge arm device in a switching period, V cel ;

[0049] using the voltage sensor to obtain the DC bus voltage Vdc ;

[0050] The average value of the port voltage of the electric drive inverter in a switching cycle is extracted as follows:

[0051]

[0052] Wherein, v is the average value of the port voltage in a switching cycle.

[0053] Preferably, the input of the motor simulation device motor model includes the average value of the electric drive inverter port pulse voltage in a switching cycle, and the motor simulation device motor model is obtained in any one or more of the following ways:

[0054] By mathematical modeling of the target motor;

[0055] By extracting the target motor parameters through simulation software or motor design software;

[0056] By extracting the target motor parameters through experiments.

[0057] According to the second aspect of the present application, a motor working condition simulation method integrated with port switch voltage online monitoring is provided, which is based on the motor working condition simulation device integrated with port switch voltage online monitoring, uses the port voltage of the electric drive inverter, obtains the key information of the electric drive inverter port voltage, and uses the key information as the input of the motor simulation device motor model, the carrier synchronization of the simulation inverter and the electric drive inverter in the motor working condition simulation device, and the active harmonic elimination.

[0058] Compared with the prior art, the embodiment of the present application has at least one of the following beneficial effects:

[0059] The motor working condition simulation device integrated with port switch voltage online monitoring provided by the embodiment of the present application has a novel design structure, which can realize the carrier synchronization of the simulation inverter and the electric drive inverter to reduce the current ripple without the need of the electric drive inverter to provide a synchronization signal, and realizes the extraction of the average value of the port voltage without the need of a voltage sampling filter, thereby improving the dynamic performance of the motor working condition simulation device. BRIEF DESCRIPTION OF DRAWINGS

[0060] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the attached drawings:

[0061] Figure 1 FIG. 1 is a structural schematic diagram of the motor working condition simulation device integrated with port switch voltage online monitoring in an embodiment of the present application;

[0062] Figure 2This is a schematic diagram of online monitoring of the port switch voltage of an electric drive converter in a preferred embodiment of the present invention;

[0063] Figure 3 This is a schematic diagram of online monitoring of the port switch voltage of an electric drive converter in a preferred embodiment of the present invention;

[0064] Figure 4 This is a schematic diagram illustrating the extraction of key information about the port voltage of the electric drive converter in a preferred embodiment of the present invention.

[0065] In the diagram, 1 is the motor operating condition simulation device, 2 is the simulated converter, 3 is the impedance network, 4 is the port switch voltage online monitoring board, 5 is the voltage sensor, 6 is the current sensor, 7 is the motor simulation controller, 8 is the speed signal generator, 9 is the AC test port, and 10 is the speed signal port. Detailed Implementation

[0066] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0067] like Figure 1 As shown, in one embodiment of the present invention, a motor operating condition simulation device integrating online monitoring of port switch voltage is provided, including a port switch voltage online monitoring board 4, a voltage sensor 5, a simulated converter 2, a resistive impedance network 3, a motor simulation controller 7, a speed signal generator 8, and a current sensor 6.

[0068] The port switch voltage online monitoring board 4 is used to measure the voltage drop across the power semiconductor devices in the electric drive converter when they are turned on; simultaneously, it converts the high-voltage port pulse voltage during the operation of the analog converter into a lower-voltage pulse signal with a consistent width; the input terminal of the port switch voltage online monitoring board 4 is connected to the AC test port and the positive and negative buses of the analog converter; such as Figure 2 As shown, the input terminal of the port switch voltage online monitoring board is connected to the AC test port and the positive and negative buses of the electric drive converter under test; as Figure 3 As shown, the input terminal of the port switch voltage online monitoring board is connected to the collector and emitter IGBT of the power semiconductor device in the electric drive converter under test, or to the drain and source MOSFET.

[0069] Voltage sensor 5 is used to acquire the DC bus voltage during the operation of the analog converter; the input terminal of voltage sensor 5 is connected to the positive bus and negative bus of the converter.

[0070] The analog converter 2 is used to reproduce the port voltage and current characteristics of the electric drive converter, adopts any one of the DC / AC topology structures or power semiconductor devices, and is connected to the electric drive converter through the resistance and impedance network.

[0071] The motor simulation controller 7 is used to establish a target motor model and control the analog converter to reproduce the port voltage and current characteristics of the electric drive converter, and is connected to the output end of the port switch voltage online monitoring board, the output end of the voltage sensor 5 and the output end of the current sensor 6.

[0072] The rotating speed signal generator 8 is used to generate the rotating speed signal required by the electric drive controller, realizes the decoupling between the motor simulation device and the electric drive controller, receives the rotating speed information calculated by the motor simulation controller, and converts the rotating speed information into a rotating speed signal, and the output end of the rotating speed signal generator 8 is connected to the electric drive controller.

[0073] The resistance and impedance network 3 is used to filter the high-frequency ripple current of the alternating current test port, includes a differential mode resistance and impedance network and a common mode resistance and impedance network, one end of which is connected to the electric drive converter to be tested, and the other end of which is connected to the analog converter.

[0074] The current sensor 6 is used to obtain the current value of the alternating current test port.

[0075] Based on the topological structure and functional design of the motor working condition simulation device in the above embodiment, in a preferred embodiment of the present application, the port switch voltage online monitoring board can obtain the key information of the port voltage of the electric drive converter using the port voltage of the electric drive converter without relying on the voltage low-pass filter, the carrier signal of the electric drive converter, the modulation signal or other voltage sampling devices.

[0076] The key information of the port voltage of the electric drive converter includes but is not limited to the average value of the port pulse voltage in a switching cycle, the pulse width modulation mode of the converter, the carrier signal of the converter, the modulation signal of the converter, etc.

[0077] The use of the key information of the port voltage of the electric drive converter includes but is not limited to the input of the motor model of the motor simulation device, the carrier of the analog converter and the electric drive converter in the motor working condition simulation device, active harmonic elimination, etc.

[0078] In some preferred embodiments, a preferred process for extracting the carrier signal of the electric drive converter is provided, and the specific steps are as follows:

[0079] S101: Determine the modulation signal loading point of the electric drive converter.

[0080] The port switch voltage on-line monitoring board obtains the on and off time count of the electric drive converter port pulse signal, the first on count value is c1, the first off count value is c2, the count of 6 on and off periods is continuously counted (the count values are c1-c6), if the count values satisfy: c1+2·c2+c3=c3+2·c4+c5, the loading point is the carrier peak value; if the count values satisfy c2+2·c3+c4=c4+2·c5+c6, the loading point is the carrier valley value.

[0081] S102: Extract the carrier period of the electric drive converter.

[0082] When the electric drive converter modulation signal loading point is the carrier peak value, the carrier period is:

[0083]

[0084] When the electric drive converter modulation signal loading point is the carrier valley value, the carrier period is:

[0085]

[0086] Where, t sw is the carrier period, t ctrl is the count period.

[0087] S103: Extract the carrier phase of the electric drive converter.

[0088] When the electric drive converter modulation signal loading point is the carrier peak value, the low level time of the electric drive converter port voltage is counted, and after the counting is completed, the carrier count value is reset according to the following formula:

[0089]

[0090] When the electric drive converter modulation signal loading point is the carrier valley value, the high level time of the electric drive converter port voltage is counted, and after the counting is completed, the carrier count value is reset:

[0091]

[0092] Where, c re is the extracted carrier count value, c x_off is the count value of the low level time of the electric drive converter port voltage, and c x_on is the count value of the high level time of the electric drive converter port voltage.

[0093] In some preferred embodiments, a preferred process for extracting the modulation signal of the electric drive converter is provided, and the specific steps are as follows:

[0094] S201: Extract the carrier cycle of the electric drive converter according to S101-S103 in the above embodiments; taking the carrier peak value of the electric drive converter modulation signal loading point as an example, the carrier cycle is t sw ;

[0095] S202: Count the high level time of the electric drive converter port voltage, and the count value is c x_on ;

[0096] S203: Calculate the modulation signal value of the converter in each switching cycle as follows:

[0097]

[0098] Wherein, duty is the modulation signal value of the electric drive converter in each switching cycle.

[0099] In some preferred embodiments, a preferred process for extracting the average value of the electric drive converter port pulse voltage in one switching cycle is provided, as shown in Figure 4 , and the main steps are as follows:

[0100] S301: Extract the modulation signal of the electric drive converter according to S201-S203 in the above embodiments;

[0101] S302: Obtain the on-state voltage drop V ceu of the converter bridge arm device in one switching cycle using the port switch voltage online monitoring board, and V cel ;

[0102] S303: Obtain the DC bus voltage V dc when the converter is running using the voltage sensor;

[0103] S304: Extract the average value of the electric drive converter port voltage in one switching cycle as follows:

[0104]

[0105] Wherein, v is the average value of the port voltage in one switching cycle.

[0106] Further, the input of the motor simulation device motor model includes the extracted average value of the electric drive converter port pulse voltage in one switching cycle, and the motor simulation device motor model is obtained in any one or more of the following ways:

[0107] By mathematical modeling of the target motor;

[0108] By extracting the parameters of the target motor through simulation software, motor design software, etc.

[0109] The target motor parameters are extracted through experiments and the like.

[0110] In some preferred embodiments, a preferred process for extracting the pulse width modulation mode is provided, including:

[0111] According to the modulation signal of the electric drive inverter obtained in S201-S203, the modulation signal of the electric drive inverter in n fundamental periods is recorded continuously;

[0112] If the modulation signal of the electric drive inverter is a sine wave, the pulse width modulation mode of the electric drive inverter is SPWM;

[0113] If the modulation signal of the electric drive inverter is a saddle wave, the pulse width modulation mode of the electric drive inverter is CPWM;

[0114] If the modulation signal of the electric drive inverter is a clamped, non-continuous waveform, the pulse width modulation mode of the electric drive inverter is DPWM.

[0115] In some specific embodiments, the key information of the port voltage of the electric drive inverter is extracted, as shown in Figure 4 As shown in the figure, a is the modulation process of the electric drive inverter, including the carrier (triangular wave) and the modulation wave (bright blue). The selected modulation mode is SPWM. B is the port voltage output by the electric drive inverter after modulation, that is, the voltage drop (red) between the low side IGBT of the electric drive inverter. Blue is the waveform after high voltage clamping by the port switch voltage online monitoring device. The main purpose of clamping is to reduce the voltage level, so as to facilitate the input of the waveform into the motor analog controller. C is the counting result of the port voltage output by the electric drive inverter after clamping by the motor analog controller, including the high level counting and low level counting result. The counting result is used for key information extraction. D is the carrier (triangular wave) of the electric drive inverter extracted according to the waveform after high voltage clamping by the port switch voltage online monitoring device and the square wave signal used for carrier synchronization of the motor analog inverter

[0116] Based on the same inventive concept, another preferred embodiment of the present application provides a motor working condition simulation method integrated with port switch voltage online monitoring, based on a motor working condition simulation device integrated with port switch voltage online monitoring, using the port voltage of the electric drive inverter, obtaining the key information of the electric drive inverter port voltage, for the calculation of the motor model of the motor simulation device, the carrier synchronization of the simulation inverter and the electric drive inverter in the motor working condition simulation device, and the active harmonic elimination.

[0117] The specific steps in the above examples of the present application can refer to the corresponding implementation technologies of the motor working condition simulation device integrated with port switch voltage online monitoring in the above embodiments, which will not be described here.

[0118] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various modifications or changes can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. The above preferred features can be combined in any manner without conflict, and used.

Claims

1. A motor operating condition simulation device integrating online monitoring of port switch voltage, characterized in that, include: Port switch voltage online monitoring board, voltage sensor, analog converter, impedance network, motor analog controller, speed signal generator and current sensor; The port switch voltage online monitoring board is used to measure the voltage drop across the power semiconductor device in the electric drive converter under test when it is turned on; at the same time, it converts the port pulse voltage with a higher voltage level during the operation of the simulated converter into a pulse signal with a lower voltage level and consistent width. Its input terminal is connected to the AC test port and the positive and negative buses of the analog converter; the input terminal of the port switch voltage online monitoring board is connected to the AC test port and the positive and negative buses of the electric drive converter under test. or, The input terminal of the port switch voltage online monitoring board is connected to the corresponding electrode of the power semiconductor device in the electric drive converter under test: for IGBT devices, it connects the collector and emitter; for MOSFET devices, it connects the drain and source. The voltage sensor is used to acquire the DC bus voltage during the operation of the analog converter; its input terminal is connected to the positive bus and negative bus of the analog converter. The analog converter is used to reproduce the port voltage and current characteristics of the electric drive converter under test, and can adopt any DC / AC topology or power semiconductor device; the analog converter is connected to the electric drive converter under test through the impedance network. The motor simulation controller is used to establish a target motor model and control the simulation converter to reproduce the port voltage and current characteristics of the electric drive converter under test; it is connected to the output terminal of the port switch voltage online monitoring board, the output terminal of the voltage sensor, and the output terminal of the current sensor. The speed signal generator is used to generate the speed signal required by the electric drive controller, thereby decoupling the motor simulation device from the electric drive controller. It receives the speed information calculated by the motor simulation controller and converts the speed information into a speed signal; the output terminal of the speed signal generator is connected to the electric drive controller; The impedance network is used to filter out the high-frequency ripple current of the AC test port, and includes a differential mode impedance network and a common mode impedance network; one end of it is connected to the electric drive converter under test, and the other end is connected to the analog converter. The current sensor is used to acquire the current value at the AC test port.

2. The motor operating condition simulation device for integrated port switch voltage online monitoring according to claim 1, characterized in that, The port switch voltage online monitoring board can obtain key information about the port voltage of the electric drive converter by using the port voltage of the electric drive converter without relying on a voltage low-pass filter, electric drive converter carrier signal, modulation signal or voltage sampling device. The key information regarding the port voltage of the electric drive converter includes one or more of the following: The average value of the port pulse voltage over one switching cycle; Pulse width modulation method of electric drive converter; Carrier signal of electric drive converter; Modulation signal of electric drive converter.

3. The motor operating condition simulation device for integrated port switch voltage online monitoring according to claim 2, characterized in that, The key information of the port voltage of the electric drive converter can be used as the input of the motor model in the motor simulation device, the carrier wave of the simulated converter and the electric drive converter in the motor operating condition simulation device, and the active harmonic elimination.

4. The motor operating condition simulation device for integrated port switch voltage online monitoring according to claim 2, characterized in that, The carrier signal extraction process of the electric drive converter includes: Determine the modulation signal loading point of the electric drive converter: Count the turn-on and turn-off times of the pulse signal at the port of the electric drive converter obtained by the online monitoring board of the port switch voltage. The first turn-on count value is c1, and the first turn-off count value is c2. Count continuously for 6 turn-on and turn-off cycles, with count values ​​from c1 to c6 respectively. If the count values ​​satisfy: Then the loading point is the carrier peak value; if the count value satisfies Then the loading point is the carrier valley value; Extracting the carrier period of the electric drive converter: When the modulation signal loading point of the electric drive converter is at the carrier peak value, the carrier period is: ； When the modulated signal loading point of the electric drive converter is at a carrier valley value, the carrier period is: ； Among them, t sw For the carrier period, t ctrl For counting periods; Extracting the carrier phase of the electric drive converter: When the modulation signal loading point of the electric drive converter is at the carrier peak, count the low-level time of the electric drive converter port voltage. After the counting is completed, reset the carrier count value. ； When the modulation signal loading point of the electric drive converter is at a carrier valley value, the high-level time of the electric drive converter port voltage is counted, and the carrier count value is reset after the counting is completed. ； Among them, c re For the extracted carrier count value, c x_off c is the count value of the low-level time of the voltage at the port of the electric drive converter. x_on This is the count value of the high-level time of the voltage at the port of the electric drive converter.

5. The motor operating condition simulation device for integrated port switch voltage online monitoring according to claim 4, characterized in that, The modulation signal extraction process of the electric drive converter includes: Extracting the carrier period t of the electric drive converter sw ; The high-level time of the voltage at the port of the electric drive converter is counted, and the count value is c. x_on ; The calculated modulation signal value of the converter for each switching cycle is: ； Where duty is the modulation signal value of the electric drive converter for each switching cycle.

6. The motor operating condition simulation device for integrated port switch voltage online monitoring according to claim 5, characterized in that, The extraction process of the pulse width modulation method includes: Based on the modulation signal of the electric drive converter, the modulation signal of the electric drive converter is continuously recorded within n fundamental cycles; If the modulation signal of the electric drive converter is a sine wave, then the pulse width modulation method of the electric drive converter is SPWM; If the modulation signal of the electric drive converter is a saddle wave, then the pulse width modulation method of the electric drive converter is CPWM; If the modulation signal of the electric drive converter is a clamping, discontinuous waveform, then the pulse width modulation method of the electric drive converter is DPWM.

7. The motor operating condition simulation device for integrated port switch voltage online monitoring according to claim 6, characterized in that, The process of extracting the average value of the port pulse voltage of the electric drive converter over one switching cycle includes: Extract the modulation signal from the electric drive converter; Using a port switch voltage online monitoring board, the on-state voltage drop V of the converter bridge arm device during one switching cycle can be obtained. ceu V cel ; The DC bus voltage V during converter operation is obtained using a voltage sensor. dc ; The average value of the port voltage of the electric drive converter within one switching cycle is extracted as follows: ； in, v This represents the average port voltage over one switching cycle.

8. The motor operating condition simulation device for integrated port switch voltage online monitoring according to claim 7, characterized in that, The input to the motor model of the motor simulation device includes the average value of the pulse voltage at the port of the electric drive converter within one switching cycle, and the motor model of the motor simulation device is obtained using any one or more of the following methods: This is obtained by mathematically modeling the target motor; The parameters of the target motor are extracted using simulation software and motor design software. The parameters of the target motor were extracted through experiments.

9. A method for simulating motor operating conditions by integrating online monitoring of port switch voltage, characterized in that, Based on the motor operating condition simulation device with integrated port switch voltage online monitoring as described in any one of claims 1-8, the port voltage of the electric drive converter is used to obtain key information of the port voltage of the electric drive converter, which is used for input of the motor model of the motor simulation device, carrier synchronization of the simulated converter and the electric drive converter in the motor operating condition simulation device, and active harmonic elimination.

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